Need help with app

I'm assuming you want to connect a Fitbit or Garmin device??? This is possible.
Someone posted that they were successful by following these directions:
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To link your Fitbit or Garmin device to your Carb Manager account, please go to Settings > Carb Manager App Settings > Fitness Device Links. Please do ensure that you are syncing from the website and have your pop-up blocker disabled.
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Hope this helps.